Once kids are around 7 kids should be mostly independent at playdates, so I'm not sure what there is to hate. You offer them all a snack, check on them once in a while, and otherwise get stuff done at home. Or drop them at a friends house and go do errands for a few hours.
Younger than 7, or playdates where parents stick around, are definitely annoying, but good for kids (and nice if you like the other parent).